US5008741A
Expired / Lapsed
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Method and apparatus for processing component signals to preserve high frequency intensity information
Assignee: Tektronix Inc
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Filing: 1989-04-07
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Granted: 1991-04-16
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Expires: 2009-04-07
Abstract
Abstract A video signal in component form is processed by generating two chroma component signals which have a selected bandwidth and are GAMMA corrected, generating a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, and GAMMA correcting the linear luminance component signal to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Inventors
- 👤 David L. Knierim
- 👤 Gary L. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:46
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/68; H04N9/69
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
86 words
A method of processing a video signal in component form, comprising: (a) generating two chroma component signals which have a selected bandwidth and are GAMMA corrected, (b) generating a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, and (c) GAMMA correcting the linear luminance component signal by combining the linear luminance component signal and the chroma component signals to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 2
Independent Claim
86 words
A method of processing a video signal in component form, comprising: (a) generating two chroma component signals which have a selected bandwidth and are GAMMA corrected, (b) generating a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, and (c) GAMMA correcting the linear luminance component signal by combining the linear luminance component signal and the chroma component signals to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 3
Dependent Claim
33 words
A method according to claim 1, wherein step (a) comprises generating three GAMMA-corrected primary color component signals and applying the GAMMA-corrected color component signals to an encoding matrix that outputs chroma component signals.
Claim 4
Dependent Claim
43 words
A method according to claim 2 wherein step (b) comprises removing the GAMMA correction of the GAMMA-corrected color component signals to provide linear color component signals and applying the linear color component signals to a luminance matrix that outputs a luminance component signal.
Claim 5
Dependent Claim
40 words
A method according to claim 1, wherein step (a) comprises generating three linear primary color component signals, GAMMA correcting the linear color component signals, and applying the GAMMA-corrected color component signals to an encoding matrix that outputs chroma component signals.
Claim 6
Dependent Claim
27 words
A method according to claim 4, wherein step (b) comprises applying the linear primary color component signals to a luminance matrix that outputs a luminance component signal.
Claim 7
Dependent Claim
43 words
A method according to claim 1, wherein step (c) comprises generating a GAMMA-corrected luminance component signal Y such that Y' is substantially equal to ##EQU4## where Y' is the linear luminance component signal and CR and CB are the GAMMA-corrected chroma component signals.
Claim 8
Dependent Claim
33 words
A method according to claim 1, wherein step (c) comprises generating a GAMMA-corrected luminance component signal Y such that Y' is substantially equal to Y**GAMMA, where Y' is the linear luminance component signal.
Claim 9
Dependent Claim
88 words
Apparatus for processing a video signal in component form, comprising: means for providing two chroma component signals which have a selected bandwidth and are GAMMA corrected, means for providing a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, and means for GAMMA correcting the linear luminance component signal by combining the linear luminance component signal and the chroma component signals to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 10
Dependent Claim
88 words
Apparatus for processing a video signal in component form, comprising: means for providing two chroma component signals which have a selected bandwidth and are GAMMA corrected, means for providing a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, and means for GAMMA correcting the linear luminance component signal by combining the linear luminance component signal and the chroma component signals to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 11
Dependent Claim
72 words
Apparatus according to claim 8, wherein the means for providing the two chroma component signals comprise means for providing linear primary color component signals, means for GAMMA correcting the linear primary color component signals, an encoding matrix connected to receive the GAMMA-corrected color component signals and to output chroma component signals, and low pass filter means for receiving the chroma component signals from the matrix and limiting them to said selected bandwidth.
Claim 12
Dependent Claim
33 words
Apparatus according to claim 9, wherein the means for providing the linear luminance signal comprise a luminance matrix connected to receive the linear primary color component signals and to output a luminance signal.
Claim 13
Dependent Claim
42 words
Apparatus according to claim 8, wherein the means for providing the two chroma component signals comprise means for providing GAMMA-corrected primary color component signals and an encoding matrix connected to receive the GAMMA-corrected color component signals and to output chroma component signals.
Claim 14
Dependent Claim
51 words
Apparatus according to claim 11, wherein the means for providing the linear luminance component signal comprise means for removing the GAMMA-correction of the GAMMA-corrected primary color component signals to provide linear color component signals, and a luminance matrix connected to receive the linear color component signals and output a luminance signal.
Claim 15
Independent Claim
100 words
A method of processing a video signal in component form, comprising: (a) generating two chroma component signals which have a selected bandwidth and are GAMMA corrected, (b) generating a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, (c) low pass filtering for limiting the linear luminance signal, whereby the linear luminance signal is limited to a bandwidth greater than said selected bandwidth, and (d) GAMMA correcting the bandwidth-limited linear luminance component signal to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 16
Independent Claim
100 words
A method of processing a video signal in component form, comprising: (a) generating two chroma component signals which have a selected bandwidth and are GAMMA corrected, (b) generating a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, (c) low pass filtering for limiting the linear luminance signal, whereby the linear luminance signal is limited to a bandwidth greater than said selected bandwidth, and (d) GAMMA correcting the bandwidth-limited linear luminance component signal to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 17
Dependent Claim
33 words
A method according to claim 13, wherein step (a) comprises generating three GAMMA-corrected primary color component signals and applying the GAMMA-corrected color component signals to an encoding matrix that outputs chrome component signals.
Claim 18
Dependent Claim
43 words
A method according to claim 14, wherein step (b) comprises removing the GAMMA correction of the GAMMA-corrected color component signals to provide linear color component signals, and applying the linear color component signals to a luminance matrix that outputs a luminance component signal.
Claim 19
Dependent Claim
40 words
A method according to claim 13, wherein step (a) comprises generating three linear primary color component signals, GAMMA correcting the linear color component signals, and applying the GAMMA-corrected color component signals to an encoding matrix that outputs chroma component signals.
Claim 20
Dependent Claim
27 words
A method according to claim 16, wherein step (b) comprises applying the linear primary color component signals to a luminance matrix that outputs a luminance component signal.
Claim 21
Dependent Claim
31 words
A method according to claim 14, wherein the encoding matrix also outputs a GAMMA-corrected luminance component signal, and step (b) comprises removing the GAMMA correction of the GAMMA-corrected luminance component signal.
Claim 22
Dependent Claim
28 words
A method according to claim 13, wherein step (c) comprises combining the linear luminance component signal and the chroma component signals to provide the GAMMA-corrected luminance component signal.
Claim 23
Dependent Claim
43 words
A method according to claim 19, wherein step (c) comprises generating a GAMMA-corrected luminance component signal Y such that Y' is substantially equal to ##EQU5## where Y' is the linear luminance component signal and CR and CB are the GAMMA-corrected chroma component signals.
Claim 24
Dependent Claim
33 words
A method according to claim 13, wherein step (c) comprises generating a GAMMA-corrected luminance component signal Y such that Y' is substantially equal to Y**GAMMA, where Y' is the linear luminance component signal.
Claim 25
Dependent Claim
100 words
Apparatus for processing a video signal in component form, comprising: means for providing two chroma component signals which have a selected bandwidth and are GAMMA corrected, means for providing a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, means for lowpass filtering the linear luminance component signal whereby the linear luminance signal is limited to a bandwidth greater that the selected bandwidth, and means for GAMMA correcting the linear luminance component signal to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 26
Dependent Claim
100 words
Apparatus for processing a video signal in component form, comprising: means for providing two chroma component signals which have a selected bandwidth and are GAMMA corrected, means for providing a linear luminance component signal which has a greater bandwidth than the chroma component signals and is not GAMMA corrected, means for lowpass filtering the linear luminance component signal whereby the linear luminance signal is limited to a bandwidth greater that the selected bandwidth, and means for GAMMA correcting the linear luminance component signal to provide a GAMMA-corrected luminance component signal having a greater bandwidth than the GAMMA-corrected chroma component signals.
Claim 27
Dependent Claim
72 words
Apparatus according to claim 22, wherein the means for providing the two chroma component signals comprise means for providing linear primary color component signals, means for GAMMA correcting the linear primary color component signals, an encoding matrix connected to receive the GAMMA-corrected color component signals and to output chroma component signals, and low pass filter means for receiving the chroma component signals from the matrix and limiting them to said selected bandwidth.
Claim 28
Dependent Claim
33 words
Apparatus according to claim 23, wherein the means for providing the linear luminance signal comprise a luminance matrix connected to receive the linear primary color component signals and to output a luminance signal.
Claim 29
Dependent Claim
42 words
Apparatus according to claim 22, wherein the means for providing the two chroma component signals comprise means for providing GAMMA-corrected primary color component signals and an encoding matrix connected to receive the GAMMA-corrected color component signals and to output chroma component signals.
Claim 30
Dependent Claim
51 words
Apparatus according to claim 25, wherein the means for providing the linear luminance component signal comprise means for removing the GAMMA-correction of the GAMMA-corrected primary color component signals to provide linear color component signals, and a luminance matrix connected to receive the linear color component signals and output a luminance signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |